Radio Shack TRS-80 Manual de usuario

•

erv1ce

TRS·BD®

DT-1

Catalog Number 26-6050

CUSTOM MANUFACTURED IN U.S.A. BY RADIO SHACK, A DIVISION OF TANDY CORPORATION

TRS-80® DT-1

Manual

All

Rights Reserved

Reproduction or use, without express written permission

from Tandy Corporation,

any portion

this manual is

prohibited. While reasonable efforts have been taken in

the

preparation

this manual

assure its accuracy, Tandy

Corporation assumes no liability resulting from any errors or

omissions in this manual, or from the use

the information

obtained herein.

-----------TRS-BO

-----------

TRS-8S

DT-1

Service

Manual

26-6SSS

----------llad1elhaek

----------

----------TRS-BO

---------

---------llad1elhaell---------

___

.....,D-.T_-

...

________

TRS-BO

.....:i;;S~e.;:;.r.:.v.:.i~c~e~M~a;,;,,:;no=u

a_1

____

Table

Contents

l/Specifications

••••••••••••••••••••••••••••••••••••

2/Dissassembly

Instructions

•••••••••••••••••••••••••

3/Troubleshooting

Chart

•••••••••••••••••••••••••••••

4/Pr

inted

Circuit

Board

Layout

••••••••••••••••••••••

5/Parts

List

.............................

........

6/Schematic

Diagram

.................................

7/Theory

Operation

•••••••••••••••••••••••••••••••

-----------

llad1elhaell----------

- 3 -

DT-1

---~.....;;.

_______

TRS-BO

___

s...,e.;;.r.;..v,;;.ic;;;.;e:;;...:,M;:,:;a:,;n~u;;:a;;;,l

---------

lladme

lhaell---------

- 4 -

___

......

...

T._-

1.....

_______

TRS-BO

......

...

e.r

...

e...,..M

....

...

n_u_a_1

____

Specifications

Power

Supply

Power

Requirements

Power

Consumption

Temperature

Range

Humidity

Range

non-condensing

Size

Weight

1~5-13~

VAC,

watts

11~

(13

1~%

8~%

relative

18.5"

12"

21"

Cl7cm

cm x

53cm)

23.4

lbs

(l~.5kg)

RS-232-C

Input/Output

============================================================

Signal

Function

=============================================================

Protective

Ground

Transmit

Data

Receive

Data

RTS

Request

Send

CTS

Clear

Send

DSR

Data

Set

Ready

Signal

Ground

Carrier

Detect

DTR

Data

Terminal

Ready

============================================================

Table

-----------lladte

lhaell-----------

- 5 -

---

-T---

-------TRS-BO

Service

Manual

RS-232-C

Serial

Printer

============================================================

Signal

Function

====:========================================================

Protective

Ground

Transmit

Data

CTS

Clear

Send

DSR

Data

Set

Ready

Signal

Ground

Carrier

Detect

DTR

Data

Terminal

Ready

============================================================

Table

Parallel

Printer

Interface

==========================================

===============

Signal

Function

=======================================================

Strobe

Clock

the

data

from

the

processor

the

printer

Data

Bit

LSB

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

Data

Bit

output

data

byte

(MSB)

BUSY

Input

Termnal

from

Printer

High

indicaGes

busy

===========================================================

Table

----------ltad1elhaell----------

- 6 -

________

D_T_-_1

_________________

"TFISi-E3CJ

____

__.s.e_r_v_i_c_e,__M_a_n_u_a_1

______

2/Dissassembly

Instructions

Turn

the

DT-1

upside

down

your

work

area.

Remove

the

screws

from

the

bottom.

Rotate

the

DT-1

rightside

up.

You

must

hold

the

top

and

bottom

section

together

during

this

operation.

Leave

room

the

left

for

the

top

rest.

Lift

off

the

top

section

and

lay

its

side

the

left

the

bottom

section.

The

unit

may

operated

this

position

for

test

purposes.

Further

Dissassembly

desired

the

top

section

may

separated

from

the

bottom

section.

this

unplug

the

cable

from

the

edge

connector

and

the

grounding

lead

from

the

spade

lug

ground

connector

the

Video

Board.

The

top

and

bottom

sections

are

now

separate.

Circuit

Board

Removal

these

steps

remove

the

circuit

board

from

the

bottom

section

the

DT-1:

Unplug

the

cables

going

the

video

board,

the

power

supply

and

the

keyboard.

Remove

the

nuts

and

washers

holding

the

circuit

board

the

bottom

section.

Unplug

the

power

indicator

cable

going

the

keyboard

from

the

main

circuit

board.

--------------------------------nat11elhaell-------------------------------

- 7 -

_______

D_T_-_1----------------"T~!S-EICJ®

_____

s_e_r_v_1_·c.e.....,M_a_n_u_a_1

______

CRT

Removal.

very

careful

removing

the

CRT.

fragile,

and

could

dangerous

broken.

Never

hold

the

neck.

the

steps

below.

Remove

the

plug

from

the

end

the

neck.

Gently

pull

straight

back.

careful

not

bend

the

pins.

Check

sure

you

haven't

shorted

terminals

components

mounted

the

plug.

Remove

the

yoke

from

the

neck

loosening

the

clamping

screw,

then

pulling

the

yoke

straight

back.

careful

avoid

the

pins

the

end

the

neck

the

CRT.

remove

the

anode

lead,

loosen

the

plastic

insulating

cover

from

the

CRT,

then

remove

the

lead

pressing

one

side

the

connector

while

gently

lifting

the

other.

Remove

the

screws

holding

the

video

board

the

top

section

and

set

the

board

one

side

allow

access

the

CRT

mounting

studs.

Remove

the

nuts

and

washers

from

the

mounting

studs

each

corner

the

mask.

Supporting

the

CRT

from

the

body

(not

the

neck)

lift

and

back

off

the

studs.

Lay

soft

cloth

face

down.

Finally

unhook

the

spring

and

the

two

loops

braid

from

the

corners

the

CRT.

Keyboard Removal

remove

the

keyboard,

Take

out

the

screws

that

hold

the

mask

the

bottom

section.

Lift

off

the

mask

and

the

keyboard.

Unplug

the

ribbon

cable

going

the

main

circuit

board

and

the

grounding

spade

lug

from

the

left

end

the

keyboard.

See

Figure

-------------------------------nad1elhaell------------------------------

- 8 -

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